Senior Obama administration officials, including the White House chief of staff, knew as early as 2009 that Hillary Rodham Clinton was using a private email address for her government correspondence, according to some 3,000 pages of correspondence released by the State Department late Tuesday night The chief of staff, Rahm Emanuel, requested Clinton's email address on Sept. 5, 2009, according to one email. His request came three months after top Obama strategist David Axelrod asked the same question of one of Clinton's top aides